A hydraulic telegraph (Greek: υδραυλικός τηλέγραφος) refers to two different semaphore systems involving the use of water-based mechanisms as a telegraph...

light signals have replaced semaphore signals in most countries. A hydraulic telegraph can refer to either one of two different semaphore systems. The earliest...

systems are thus not true telegraphs. The earliest true telegraph put into widespread use was the Chappe telegraph, an optical telegraph invented by Claude Chappe...

Electrical telegraphs were point-to-point text messaging systems, primarily used from the 1840s until the late 20th century. It was the first electrical...

Transatlantic telegraph cables were undersea cables running under the Atlantic Ocean for telegraph communications. Telegraphy is an obsolete form of communication...

Archived 2022-11-01 at the Wayback Machine, Volume 2, Part 1, International Telegraph and Telephone Consultative Committee, International Telecommunication...

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The Nippon Telegraph and Telephone Corporation (NTT) (Corporate Number: 7010001065142) is a Japanese telecommunications holding company headquartered...

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semaphore". Optical telegraphy dates from ancient times, in the form of hydraulic telegraphs, torches (as used by ancient cultures since the discovery of fire)...